The earned value technique is a commonly u

问题：

The earned value technique is a commonly used method of performance measurement. It integrates project scope, schedule, and cost measures to help the project management team assess project performance. If a project’s Cost Performance Index(CPI=EV/AC) value less than 1.0, it means that______.

A．the cost savings for work completed

B．the project is ahead of its planned schedule

C．the cost overrun for work completed

D．less work was completed than was planned